D9862: Don't create 2 msgbox (one of them crashes) when can't change rights.

[Jaime Torres Amate]

jtamate added a reviewer: dfaure.

REPOSITORY
  R244 KCoreAddons

REVISION DETAIL
  https://phabricator.kde.org/D9862

To: jtamate, #frameworks, dfaure
Cc: michaelh